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If the emission is a little lower in the spare tube, the HV in the TV might be a little higher. Those VT-71s are marginal in terms of insulation and arcing. It's a good idea to put some insulating goop on the terminals where the high voltage ends of the capacitors are connected (back of the centering controls). Also put some on any other connections at high voltage that have any sharp features (which tend to be where arcs come from).
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